Manufacture of pyrazolone compounds



' Patented Jan. 19, 1932 1 UNITED STA 'Monn'ncAr Mnnnozii; or LA KLEY, rrnnennsrnn, unseen-n, ssrenon 'ro Bnr'rrsn DYESTUFFS CORPORATION LIMITED, OF hiAN fififiTEE, ENGEJAND MANUFACTURE or rYsazoL-onn GGMPOUNDS 5N0 Drawing. -App1ieation filed April 2, 1927,,Se1'ia1 Ne. 1895M, and iii Great Britain May 12; 1926.

Tn all-application 0t Saunders and -Mendoza,Ser ial No. 97,758, filed' March 26, 1926,

the use of various amino derivatives of 3- earboxy -hydroxy-diphenyl sulphideis de- 5 scribed as first components in the preparation -.-I have found that such amino sulphides may beconverted into new and modified'im terrnediates which are also usetulin the production ofazo dyestufts These new modified intermediates are diphenyl sulphides, with one benzene residue carrying a chelate group useful inmordantdyeing andthe other ben-' zene residue having a pyrazolone residue attached thereto. These bodies are valuable as second or end components in the preparation of new azo dyestuffs,

They may be made from compounds having the formula i wherein R and R represent benzene residues 'Which may be further substituted and in which the OH and COOH groups are ortho to each other. Such amino sulphide compounds are diazotized to form the diazo compound and then the diazo compound is reduced to give the hydrazine compound. The hydrazine compound is condensed witha beta-ketonic ester to convertthe hydrazine group into a pyrazolone ring. As suitable beta-ketonic esters I may mention aceto acetic-ester and oXal-acetic ester, but I' do not limit myself to these compounds only. They aceto-acetic' ester forms. a methyl substituted and the oral-acetic ester forms aicarbo xyl substituted pyrazolone. The general class of beta ketonic esters is applicable to my process. i

- These new intermediates produced fin'the manner indicatedabove have the probable formula 1 7 wherein R -and R5 representbenzene residues andR represents a pyrazolone ring and in which the COOH and OH groups are ortho to each other; I" find that such new intermediates which have the'hydroXy group para to the sulphur atom are particularly advantageous, as for instance the new intermediates prepared from 3--carboxy 4 -hydroXy-d1- phenyl sulphlde or the homologues or substitution products of the same.

' portion of the molecule by the sulphide bridge linkage. The shades of the dyes vary from greemslryellow to reddish-orange according to the first component used inthe prepara tion. 1

Azodyes made from mynew intermediates maybe represented by the general formula wherein R andR represent benzene residues, R represents a pyrazolone ring and R represents coupled residue from a diazot-ized coupling component of the benzene or naphthalene series, such as a diazotized sulphanilic acid, which may be chlorine substituted, and in which the OH and COOH groups are'ortho to each other.

a One of the generic. formulm which can be used to represent both-the intermediates and the dyes of my invention is:

wherein R and R represent benzene residues both o'fwhich may be further substituted and in i which the CQOH and OH c groups are ortho to each other, R represents a pyrazolone: ring and Y represents hydrogen 'or a substituent group such as N N'R or N l R N: N-R wherein R represents a coupled residue from a diazotized coupling component of the benzene or naphthalene series, R represents the coupled residue ofan azo dye component of the benzene or naphthalene series and R represents a divalent residue of an azo dye component of the benzene or naphthalene series. By the term coupled residue of an azo dye component I mean the coupled residue from an azo dye coupling component or from a diazotized coupling component. Processes producing compounds wherein Y represents N NR .,N N-R,, are given in Example 1, below.

Other generic formulae are:

wherein R and R have their former sir; ni-fioance, R represents GP], or COOH 2111\1 Z represents the structure wherein R represents a coupled residue from a diazotized coupling component of the benzene or naphthalene series, such as a diazotized sulphanilic acid which may be chlorine substituted.

Ewample J 173 parts by weight of sulphanilic acid are diazotized in the usual manner andcombined in the presence of sodium carbonate with 422 parts of the pyrazolone of the following probable structure COOH This compound may be obtained by first reducing to the corresponding hydrazine by any of the usual methods, the sparingly soluble diazo compound resulting from the interaction of 2-amino-4l-hydroxy il-carboxy- 4'-sulphodiphenyl sulphide with the equivalent amount of nitrous acid and then con- (lensing the faintly alkaline (soda) solution of the hydrazine with the equivalent amount of ethyl acetoacetate.

Coupling ofthe diazotized sulphanilic acid with the pyrazolone so produced is very rapid and, when complete, the dyestufi' is isolated by salting out after giving the solution a slight mineral acidity.

ing the probable structure:

no so=n are obtained.

The dye itself in the form of the free acid has the probable structure:

CIOOH From an. acid bath it. dyes wool inianeven greenish yellow shade which on after-chroming becomes only slightlygreener. "A similar shade to this latter is obtained when the dye is applied to chrome mordantedwool.

In presence of chrome mordant it prints cotton a brilliant greenish-yellows.

If, in the above example, 242 parts of 2 6-dichlorosulphanilic acid areused in place of the 173 parts of sulphanilic acid, the new dyestull' produced, which is isolated in a similar 11]21I11'l61,glVeS' slightly redder shades both on wool and on cotton; while the substitution of 2:23 parts of naphthionicaci'dfor the 173-parts ofsulphanilic acid resultsin the formation of adyestufi whichproducesbright yellowish-orangeshades on wool and'cotton. 1

The same pyra'zolone when coupled in alkahne solution with. diazotlzed amino-azobenzene gives a dyestufi' wh ch dyes an orange-yellow onwool, on chrome-mordanted wool, or on wool by after-chroming, and gives orange shades when.chrome-printed on cotton. The-dyestuff similarly obtained by coupling the pyrazolone with diazotized benzene-azo-l-naphthylamine-6 (or?) -sulphonic acid, dyes wool a yellowish-red, practically unchangedinshade by chroming, and gives a red-brown when chrome-printed on cotton. Tetrazotized benzidine, coupled with two molecular, proportions of the pyrazolone gives an orange wool dycstuii, the shade being merely deepened by chroming, and when the dyestuif is chromeprinted on cotton, a light brown shade is obtained.

Example 52 173parts by weight of sulphanilic acid are diazotized in the usual manner and combined in the presence of sodium carbonate with 452 parts of the carboxypyimzolone obtained by condensing the hydrazine mentioned in EX- ample l with the equivalent amount ofoxal acetic ester in presence of sodium acetate. The pyrazolone produced has the same probable structure as that produced in Example 1, with, the exception that the methyl group in the 3-position of the pyrazolone is re placed by a carboxyl group. 7

Coupling takes place very readily and the dyestuff is obtained as a light brown powder on salting outafter giving the solution a mineral acidity, filtering and grinding. The new dyestufi. dyes wool from'an acid bath a'reddish-yellow shade which on afterchroming changes 'to'brownish-yellow, a similar shade being obtained when. the dyestutf is applied to chrome-mordanted wool.

If in the above example 242 parts of 2: G- dichloro-sulphanilic acid are used in place of 173 parts of sulphanilic acid, the new dyestufi',upon isolation in a similar manner, is

obtained as a. light brownjpowder. The direct and after-chromed shadesproduced by it on wool are slightly redder than those yielded by the dyestuif in the above example and the shade on chrome-mordanted wool is yery similar to that obtained by afterchroming'the direct shade. The dyestuii' has the probable formula Cotton is printed a reddish-yellow shade ters Patent is 1. In the manufacture of new dyestufi in-, termediates and new azo dyes therefrom, the steps which comprise diazotizing an. amino diphenyl sulphide of the type no 0 o )m-s-m nm no V wherein R and R represent benzene residues and in which the OH and 'COOH groups are ortho to each other, reducing the diazzo compound so obtained to the hydrazine compoundand then condensing the said hydra-.

zine compound with a beta-ketonic ester.

' 2. In the manufacture of new dyestufi' intermediates and new azo dyestherefrorm'the steps which comprise 'diazotizing an amino diphenyl sulphide of the type wherein R and R represent benzene residues and in which the OH and .COOH groups areortho to each other and the hydroxyl group is attached to R in the para position to the sulphide bridge, reducing the diazo compound soobtained to the hydrazine compound and thencondensing the said hydrazine compound, with a beta-ketonic ester.

3. In the manufacture of new dyestufi' intermediates and new. azo dyes therefrom, the steps whichcomprise diazotizing an amino diphenyl sulphide of the type wherein R and R represent benzene residues and in which the OH and COOH groups are ortho to each other and the hydroxyl group is attached to R in the para position to the sulphide bridge, reducing. the diazzo compound so obtained to the hydrazine compound and then condensing the said hydrazine compound with an ethyl aceto-acetic ester. 7 i

4. In the manufacture of new dyestuff intermediates and new azo dyes therefrom',the

steps which comprise diazotizing an amino diphenyl sulphide of the type COOH reducing the diazo compound so obtained to the hydrazine compound and then condensing the said hydrazine compound with an ethyl aceto-aeetic ester.

5. In the manufacture of chromable azo dyes in which the chelate grouping is separated by a sulphide bridge linking from the rest of the molecule containing chromophore groups, the process which comprises coupling a diazzo compound selected from the benzene and naphthalene series with a pyrazolone compound having the probable structure wherein R and R represent benzene residues and R represents methyl or carboxyl.

6.111 the manufacture of chromable azo dyes in which the chelate groupin is separatedby asulphide bridge linking from the rest of the molecule containing chromophore groups, the process which comprises coupling a sulphonated diazo compound selected from the benzene and naphthalene series with. a pyrazolone compound having the probable structure wherein R and R represent benzene residues and R1, represents methyl or carbonyl.

7. In the manufacture of chromable azo dyes in which the chelate grouping is separated by a sulphide bridge linking from the rest of the molecule containing chromophore groups, the process which comprises coupling a sulphonated diazo compound selected from the benzene and naphthalene series with a pyrazolone compound having the probable structure 8. In the manufacture of new dyestuli' intermmliatcs and new azo dyes therefrom, the

process which comprises diazotizing anam- 1no diphenyl sulphide of the type wherrin R, and R represents benzene residues in which the COOH and OH groups are ortho to each other, R represents a pyrazolone ring and Y represents a substituent selected from a group consisting of hydrogen or --i l:llll or NZNR -NINR. wherein It represents a coupled residue from diazotized coupling component of the benzene or naphthalene series, R; represents a a coupled residue of an azo dye component of the benzene or naphthalene series and R represents a divahant residue of an azo dye component of the benzene or naphthalene series.

10. The products of claim 9 wherein the OH group is in the to the S atom.

11. As azo dyestufi' intermediates and related azo dyestuffs, the compositions of matter represented by the mob-able formula IIOOC para position in respect wherein R and R repre ents benzene residues in which the COOH and OH groups are ortho to each other R; represents 0H,, or COOl-l and Z represents the structure wherein R represents a coupled residue from a diazotized coupling component of the benzene or naphthalene series.

12. The products of claim 11 wherein R represents the coupled residue of a diazotized sulphauilic acid which may be chlorine substituted.

13. The products of claim 11 wherein R. represents a CH group.

14:. The products of claim 11 wherein the OH group is para to the S atom.

15. As azo dycstuff intermediates and reortho to each other.

'lated azo dyestuffs, the compositions of matter represented by the probable -formula HOOC V 4 i wherein R. representsCH or COOH and Z represents the structure 19. As new dyestufl intermediates, compounds having the probable formula nooo m-s-nr-rn no I wherein R and R represent benzene residues,

R represents a pyrazolone ring and in which 7 the COOH and the OH groups are ortho to each other, the OH group being attached to R in the para position to the sulphide bridge.

20. As new dyestufi' intermediates, compounds having the probable formula wherein R and R represent benzene residues,

R represents a. methyl or carboxyl group and in which the COOH and the OH groups are ortho to each other.

21. As a new dyestulf intermediate, an aminosulphi'de having the probable formula 22. Azo dyes carrying a chelate group and adaptedfor mordant dyeing with the chelate group separated from the chromophore group by a sulphide'bridge, the azo dyes being pyrazolone derivatives having the probawherein R and R represent benzene residues, R represents a pyrazolone ring and R represents a coupled residue from a diazotized coupling component of the benzene or naphthalene series, and in which'the COOH and OH groups are ortho to each other, the said dyestufi producing shades which are substantially unchanged when chromed.

23. A20 dyes carrying a chelategroup and adapted for mordant dyeing with the chelate group separated'irom the chromophore group by a sulphide bridge, the azo dyes being pyrazolone derivatives having the probable formula i V v I V RN=N( 3j R4 wherein R and R represent benzene residues, R represents a methyl or carboxyl group and R represents a coupled residue from a diazotized coupling component of the benzene or naphthalene series, and in which the COOH and OH groups are ortho to each other, the said dyestuifs producing shades which are substantially unchanged when.

chromed.

24. As a new dyestufi', a compound obtainable by coupling diazotized sulphanilic acid with a pyrazolone, the said pyrazolone being obtainable by condensing 2-hydrazino-4-hydroXy-3-carboXy-l-sulphodiphenyl sulphide with an aceto-acetic ester, said compound in the form of the free acid having as its probable structure coon OH 30311 i i s I said dyestufi being a yellow powder, easily soluble in water to a yellow solution, the color of which is discharged by warm stannous chloride in the presence of hydrochloric acid, but not being affected by acids or alkalies of twice normal strength; said dyestufi in concentrated sulphuric acid dissolving to a brown solution, changing on dilution with water through red-brown to greenish-yellow, in concentrated hydrochloric or nitric acid giving an orange solution, becoming yellow on dilution and said'dyestuif, by reduction with hydrosulphite solution, yielding sulphanilic acid and an aminopyrazolonehaving. the probable structure CODE H2N.C("1.GH3

25. A new azo dye having the probable formula COOH In testimony whereof I affix my signature.

MORDEGA-I MENDOZA. 

